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<p>The dielectric constant and energy storage density of polyvinylidene fluoride films are both higher than those of commercial polypropylene films, and they have application prospects in the field of film capacitors. However, the PVDF films are facing problems such as low breakdown strength and low charge–discharge efficiency due to the large polarization loss. In this work, the quenching treatment for PVDF films has been proposed to regulate the crystallization behavior and suppress the polarization loss. The results show that the quenching treatment can improve the crystallinity degree and induce more <i>α</i>-phase in PVDF. It also enhances the dielectric properties and increases the breakdown strength. After the quenching treatment, the energy storage density reached as high as 13.22&#xa0;J/cm<sup>3</sup> and the charge–discharge efficiency is approximately 64% under an electric field of 519.74&#xa0;kV/mm. The quenching strategy investigated in this study offers a feasible and straightforward approach to enhancing the dielectric and energy storage properties of PVDF films.</p>

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Quenching treatment derives the enhanced energy storage performances of PVDF dielectric films

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Tiandong Zhang,
  • Shuai Chen,
  • Chao Yin,
  • Yue Zhang,
  • Changhai Zhang,
  • Yongquan Zhang,
  • Qingguo Chi

摘要

The dielectric constant and energy storage density of polyvinylidene fluoride films are both higher than those of commercial polypropylene films, and they have application prospects in the field of film capacitors. However, the PVDF films are facing problems such as low breakdown strength and low charge–discharge efficiency due to the large polarization loss. In this work, the quenching treatment for PVDF films has been proposed to regulate the crystallization behavior and suppress the polarization loss. The results show that the quenching treatment can improve the crystallinity degree and induce more α-phase in PVDF. It also enhances the dielectric properties and increases the breakdown strength. After the quenching treatment, the energy storage density reached as high as 13.22 J/cm3 and the charge–discharge efficiency is approximately 64% under an electric field of 519.74 kV/mm. The quenching strategy investigated in this study offers a feasible and straightforward approach to enhancing the dielectric and energy storage properties of PVDF films.